If you bring a plus charge near a plus charge, if my body m, has a plus charge and another plus charge is there, it'll feel a force due to that.

如果让两个正电荷靠近,如果一个物体 m 带正电荷,在这里有另一个正电荷,它就会感受到力的作用

耶鲁公开课 - 基础物理课程节选